Growth Rates of Alumina Scales on Fe–Cr–Al Alloys

Quadakkers, Willem J.; Naumenko, D.; Wessel, E.; Kochubey, V.; Singheiser, L.

doi:10.1023/b:oxid.0000016274.78642.ae

Cited by 132 publications

(68 citation statements)

References 16 publications

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“…However, HR3C steel showed exponent n = 0.3 indicating cubic time dependence law. According to Quadakkers et al [15], the process in most cases can be explained assuming that oxygen grain boundary diffusion is the dominating scale growth process in combination with an increase in oxide grain size with growth and perhaps with time.…”

Section: Methodsmentioning

confidence: 99%

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Dudziak

Deodeshmukh²,

Backert

et al. 2016

Oxid Met

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During the test, no spallation of the external oxide scale was observed. The kinetic data showed that only the 263 alloy oxidized according to parabolic behaviour, whereas the other alloys deviated from the parabolic rate law, with time exponents of 0.4-0.6 or 0.3. Finally, cross-sectioned investigations of the exposed samples revealed that Ni-based alloys underwent extended internal oxidation, with the highest extent in HAYNES Ò 282 Ò reaching 25 lm and the lowest in HAYNES

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Section: Methodsmentioning

confidence: 99%

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Dudziak

Deodeshmukh²,

Backert

et al. 2016

Oxid Met

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“…Likewise, the intergranular precipitation depth in the base metal also increases with titania percentage, so the multilayer system of top coating 97/3, with a higher alumina percentage and 53 % porosity [29] , shows the best resistance to oxidation since high alumina coatings perform very well at high temperatures [31] .…”

Section: Discussionmentioning

confidence: 99%

Oxidation behaviour at 1123 K of AISI 304-Ni/Al-Al2O3/TiO2 multilayer system deposited by flame spray

Habib¹,

Saura²,

Ferrer³

et al. 2011

REVMETAL

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The oxidation behaviour of alumina/titania (97/3, 87/13 and 60/40) ceramic coatings using a Ni-Al coupling layer was studied in a thermobalance. Both layers were deposited on an AISI 304 stainless steel base metal by the flame spray technique. The coated steel was heated from room temperature to 1,123 K at 40 K min -1 , oxidized in air for 50 h, and then cooled to room temperature at 40 K min -1 . The mass gain was mainly attributed to the oxidation of Ni-Al coupling layer. Kinetic laws, DW·S -1 (mg.mm -2 ) vs. time (hours) were close to a parabolic plot for each sample. Surface composition of ceramic top layer and the cross section of multilayer system were analysed using a wide range of experimental techniques including Scanning Electron Microscopy (SEM), equipped with a link energy dispersive X-Ray spectroscopy (EDX) and X-Ray diffraction (XRD) before and after the oxidation process. Coatings 97/3 and 87/13 presented a stable structure after flame spray deposition and they did not evolve with the oxidation process, while most of the 60/40 coating changed to a metastable structure after deposition and to a more stable structure after oxidation with high micro-cracks content. SEM and EDX microanalysis of the cross-sections showed that significant oxidation and a weak intergranular precipitation had been produced in the coupling layer and on the stainless steel base metal, respectively. ResumenEl comportamiento a oxidación de recubrimientos cerámicos alúmina/titania (97/3, 87/13, 60/40) usando una capa de anclaje Ni-Al se ha estudiado mediante una termobalanza. Ambas capas se han depositado sobre un acero inoxidable AISI 304 utilizando la técnica de proyección llama (FS). El acero recubierto se ha calentado desde la temperatura ambiente hasta 1.123 K a 40 K min -1 , se ha oxidado al aire durante 50 h, y luego se ha enfriado hasta la temperatura ambiente a 40 K min -1 . La ganancia en masa se atribuye a la oxidación de la capa de enganche Ni-Al. La cinética DW·S -1 (mg.mm -2 ) vs. tiempo (horas) se ha ajustado a una ley parabólica para todas las muestras. La composición superficial de la capa cerámica y la sección transversal del sistema multicapa se han analizado mediante las técnicas de Microscopía Electrónica de Barrido (SEM), Espectroscopia de Energías Dispersivas de Rayos X (EDX), Difracción de Rayos X (XRD) antes y después del proceso de oxidación. Los recubrimientos 97/3 y 87/13 han presentado una estructura estable tras el proceso de deposición por proyección por llama y esta estructura tampoco ha evolucionado después de la oxidación, mientras la mayor parte del recubrimiento 60/40 ha cambiado a una estructura metaestable después la deposición y finalmente ha evolucionado a una estructura más estable después de la oxidación con alto contenido de microagrietamiento. El microanálisis mediante SEM y EDX de las secciones transversales han mostrado una oxidación significativa en la capa de enganche y una débil precipitación intergranular en el material base AISI 304. Palabras claveAISI 304; Capa de an...

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“…According to the n values obtained, it can be observed that only at 900°C, the oxidation kinetics of the Ni 3 Al alloy and the Ag-doped alloy follows a parabolic behavior, all other n values correspond to a subparabolic behavior. e oxidation mechanism of a protective oxide that grows with parabolic kinetics mainly consists of the diffusion of cations from the metal-oxide interface to the oxide-gas interface; however, when the oxidation mechanism approaches to cubic kinetics, some authors attribute this behavior to the oxide grain growth [67,68], although other authors claim that the formation of a protective layer like α-Al 2 O 3 is more a rule than an exception [69]. An additional characteristic of the subparabolic kinetics is that at the beginning of the oxidation process, a great weight gain is observed with respect to that observed in a parabolic kinetic, being this a characteristic of the transient stage of the oxidation process.…”

Section: Oxidation Kineticsmentioning

confidence: 99%

“…e linearity of (3) allows graphically displaying and estimating the k p value considering the slope of the Δm 2 − t relationship. In Figure 5, changes in the parabolic rate constant showing two k p values can be identified, the first k p value being greater than the second one; this is due to the fact that it is mathematically forcing a curve with a subparabolic behavior to be adjusted to a parabolic behavior [69], so the k p value that will be taken into account to characterize the oxidation process will be that of the second slope which is presented in Table 3.…”

Section: Oxidation Kineticsmentioning

confidence: 99%

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Ramos-Hernández

Porcayo-Calderón

Mayén³

et al. 2018

Advances in Materials Science and Engineering

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is paper discusses the effect of the addition of noble metals on the microstructure, mechanism, and oxidation kinetics of the Ni 3 Al intermetallic alloy. Ni 3 Al was doped with 1% (atomic percent) of Au, Ag, Pd, and Pt. Oxidation behavior of the alloys was evaluated at 900, 1000, and 1100°C in O 2 for 24 hours. XRD analysis showed that the addition of noble metals favored the oxide growth on preferential crystallographic planes. In addition, the preferential substitution of the noble metals in the Ni 3 Al structure modifies the surface composition by increasing the Al/Ni ratio. It was observed that most of the alloys showed a subparabolic behavior, and only the intermetallic base and the alloy doped with Ag show a parabolic behavior at 900°C. e developed oxides were analyzed both superficially and in cross section by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA). It was evident that only the intermetallic base showed the formation of a duplex oxide scale (Al 2 O 3 /NiO). e alloys doped with noble metals showed the oxide growth practically of pure Al 2 O 3 . is was due to a decrease in the diffusion of the Ni cations because of the presence of the noble metals in the crystalline structure.

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Growth Rates of Alumina Scales on Fe–Cr–Al Alloys

Cited by 132 publications

References 16 publications

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Oxidation behaviour at 1123 K of AISI 304-Ni/Al-Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> multilayer system deposited by flame spray

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

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Growth Rates of Alumina Scales on Fe–Cr–Al Alloys

Cited by 132 publications

References 16 publications

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Phase Investigations Under Steam Oxidation Process at 800 °C for 1000 h of Advanced Steels and Ni-Based Alloys

Oxidation behaviour at 1123 K of AISI 304-Ni/Al-Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> multilayer system deposited by flame spray

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni3Al

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Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al